US2580648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner
Assignee: United Specialties Co
•
Filing: 1946-01-21
•
Granted: 1952-01-01
•
Expires: 1966-01-21
Abstract
No abstract record available.
Inventors
- 👤 Mark L Blair
- 👤 David P Eastman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:12
CPC Classifications
B; B04; B04C; B04C5/00; B04C5/24; B04C5/28; B01; B01D; B01D46/00; B01D46/10; B01D50/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1566607A
Cited
US1405399A
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US1751915A
Cited
US1944279A
Cited
US2004468A
Cited
US2201301A
Cited
US2198963A
Cited
US2360355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-31 | 1955-07-02 | 1956-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-31 | 1959-07-02 | 1960-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-31 | 1963-07-02 | 1964-01-01 | $7700.00 | Window Closed / Lapsed |